> I'm trying to revive an early 80s CP/M board and need memory
> chips. At least 6, but 8 would be preferred. Bob G and Dave W...
> this is an old Franklin Z80 card. I'm trying to recover some
> CP/M data for someone, but my card's memory went into my old
> Ferguson Big Board many years ago, and was never replaced.
>
> If someone has the chips, let me know what you want for them.
>
> Thanks
>
> Bob
>
>
>
>
>

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Bob Grieb

Bob, Looks like it won t work after all. The 41256 s need 256 address refresh, not 128. I have 8 NEC 4164 s you could borrow, but I would need to get them

Message 2 of 7
, Feb 25, 2006

Bob,

Looks like it won't work after all. The 41256's need
256 address refresh, not 128. I have 8 NEC 4164's
you could borrow, but I would need to get them back.
You never know when I might need that Bogus board up and
running again...

> I'm trying to revive an early 80s CP/M board and need memory
> chips. At least 6, but 8 would be preferred. Bob G and Dave W...
> this is an old Franklin Z80 card. I'm trying to recover some
> CP/M data for someone, but my card's memory went into my old
> Ferguson Big Board many years ago, and was never replaced.
>
> If someone has the chips, let me know what you want for them.
>
> Thanks
>
> Bob
>
>
>
>
>

__________________________________________________
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Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

Bob Applegate

... I ve got a bucket of 41256s too, but didn t bother trying them. You did a lot more research than I did. This is to get CP/M running in order to read

> Bob,
>
> Looks like it won't work after all. The 41256's need
> 256 address refresh, not 128. I have 8 NEC 4164's
> you could borrow, but I would need to get them back.
> You never know when I might need that Bogus board up and
> running again...

I've got a bucket of 41256s too, but didn't bother trying them. You did
a lot more research than I did. This is to get CP/M running in order to
read those disks that fellow emailed us about.

The 23 year old ACE-1000 and all the peripherals came to life (including
an old Franklin monitor), but it's been years since I've used my CP/M
card. Dave, I have a lot of disks here with your handwriting on the
labels, various versions of the CP/M driver development kit, etc. It might
be fun to play with this stuff again!

Bob, I looked at the data sheet attached to the parts that Jameco is selling. It says 256-row refresh. The Z80 only counts through 128 addresses. I think

Message 4 of 7
, Feb 25, 2006

Bob,

I looked at the data sheet attached to the parts that Jameco is
selling. It says 256-row refresh. The Z80 only counts through
128 addresses. I think 128-row was std for the 4164 chips.
Just something to watch out for.

> I'm trying to revive an early 80s CP/M board and need memory
> chips. At least 6, but 8 would be preferred. Bob G and Dave W...
> this is an old Franklin Z80 card. I'm trying to recover some
> CP/M data for someone, but my card's memory went into my old
> Ferguson Big Board many years ago, and was never replaced.
>
> If someone has the chips, let me know what you want for them.
>
> Thanks
>
> Bob
>
>
>
>
>

__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

David Gesswein

... If it is providing the refresh address but only 128 it might still be ok since you won t be using the cells it doesn t refresh. I think I stuck a 256k in

Message 5 of 7
, Feb 26, 2006

> I looked at the data sheet attached to the parts that Jameco is
> selling. It says 256-row refresh. The Z80 only counts through
> 128 addresses. I think 128-row was std for the 4164 chips.
> Just something to watch out for.
>

If it is providing the refresh address but only 128 it might still be ok
since you won't be using the cells it doesn't refresh. I think I stuck
a 256k in a machine to replace a failed 64k but that was long enough ago
that I'm not positive.

Checked my stock, only have -20's

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